Fractionated soybean protein material, processed soybean suitable for the material , and processes for production of the soybean protein material and the processed soybean

Abstract

Disclosed is a process for fractionating soybean protein into 7S globulin, 11S globulin or a lipophilic protein at a high purity with good efficiency, which relates to a fractionation technique for soybean protein into proteins having characteristic properties (7S globulin, 11S globulin and a lipophilic protein) and which is a process practicable at a food industrial level. It is found that soybean protein can be fractionated into 7S globulin, 11S globulin or a lipophilic protein at a high purity with good efficiency by extracting soybean milk from processed soybean which has been subjected to a water-insolubilization treatment specific to a desired protein and fractionating the resulting soybean milk or soybean curd refuse into the desired protein.

Description

TECHNICAL FIELD[0001]The present invention relates to a fractionated soybean protein material, a processed soybean suitable for the material, and processes for production of the soybean protein material and the processed soybean. More particularly, the present invention relates to a fractionation technique for a soybean protein into proteins having characteristic properties (7S globulin, 11S globulin and a lipophilic protein).BACKGROUND ART[0002]Soybean protein has been widely utilized for improving physical properties of foods because of its peculiar gelling property, and at the same time, use of soybean protein as a highly nutritious health food material has been increased.[0003]A storage protein of a soybean is precipitated at around pH 4.5, and therefore soybean protein can be relatively simply separated into an acid-soluble protein fraction mainly containing soluble components other than a storage protein and an acid-precipitable protein fraction mainly containing a storage pro...

AI Technical Summary

Benefits of technology

[0053]According to a simple method of the present invention suitable for an effective production process, it is possible to fractionate a soybean protein into three fractions of 7S globulin, 11S globulin and a lipophilic protein with a high purity. Since said fractionation method is a method mainly comprising adjustment of pH without addition of a salt unlike a conventional fractionation method comprising addition of a salt, it does not need a dilution step and a desalting step for realizing a low ion concentration environment necessary for recovering a protein as a precipitate. Therefore, said fractionation method is an excellent method in which an operation for fractionation is simplified.

[0054]Further, it is possible to provide soybean milk and an isolated soybean protein having an excellent flavor and containing little lipophilic protein from the processed soybean of the present invention.

[0055]Since soybean milk, an isolated soybean protein, a soybean 11S protein, a soybean 7S protein, soybean curd refuse and a non-7S / 11S-acid-precipitable soybean protein which are obtained from the processed soybean of the present invention as raw material exhibit a pleasant, refreshing and extremely better flavor as compared with conventional soybean protein materials, they have increased utility value as a food material.

[0056]Further, since the lipophilic protein of the present invention has a blood cholesterol-lowering effect greater than that of a conventional isolated soybean protein, the non-7S / 11S-acid-precipitable soybean protein which is a novel material has high utility value as a health functional material.

Problems solved by technology

For this reason, there is a problem that only a simple fractionation based on dissolution behavior of both globulins for a pH can not obtain their fractions with a high purity.

Therefore, said method is effective at the experimental level, but is not suitable for an industrial process.

However, in order to obtain a soybean 11S globulin fraction with a high purity which has a decreased content rate of a lipophilic protein, a troublesome procedure was needed.

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